1) 當(dāng)let后只有一個(gè)單音節(jié)動(dòng)詞，變被動(dòng)語態(tài)時(shí)，可用不帶to 的不定式。
They let the strange go.---> The strange was let go.
2) 若let 后賓補(bǔ)較長時(shí)，let 通常不用被動(dòng)語態(tài)，而用allow或permit 代替。
The nurse let me go to see my classmate in the hospital.
I was allowed / permitted to see my classmate in the hospital.
